/*
 * Copyright (c) 2002-2009 Moxie Marlinspike
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 */

#ifndef __SESSION_CACHE_H__
#define __SESSION_CACHE_H__

#include <openssl/pem.h>
#include <openssl/conf.h>
#include <openssl/x509v3.h>
#include <openssl/ssl.h>
#include <openssl/err.h>

#include <boost/thread.hpp>
#include <boost/bind.hpp>

#define CACHE_SIZE 20
#define MAX_ENCODING_SIZE 40960
#define MAX_ID_SIZE 512

typedef struct
{
	int idLength;
	unsigned char id[MAX_ID_SIZE];
	int encodingLength;
	unsigned char encoding[MAX_ENCODING_SIZE];
} EncodedSession;

typedef struct
{
	int current;
	EncodedSession sessions[CACHE_SIZE];
} SessionCacheBlock;

class SessionCache
{

public:
	static SessionCache* getInstance();
	static SSL_SESSION * getSessionIdTramp(SSL *s, unsigned char *id, int idLength, int *ref);
	static int setNewSessionIdTramp(SSL *s, SSL_SESSION *session);

	int setNewSessionId(SSL *s, SSL_SESSION *session);
	int setNewSessionId(SSL *s, SSL_SESSION *session, unsigned char *id, int idLength);
	SSL_SESSION * getSessionId(SSL *s, unsigned char *id, int idLength, int *ref);

private:
	static SessionCache *sessionCache;
	static boost::mutex singletonLock;

	SessionCacheBlock cache;
	boost::mutex cacheLock;

	SessionCache();
	void removeSessionId(unsigned char* id, int idLength);

};


#endif
